Printed in sheets of 25 (5乘以5) 或者 50 (5乘以10) 邮票.
Originally 6.724.600 were printed but, in 1974, 5.806.000 were surcharged.
Varieties:
- line below printer´s name (pos.26) (SFCh 804a)
- additional star over "OBSERVATORIO" (pos.46) (SFCh 804b)
- shifted perforation (SFCh 804c)
- 无孔 (SFCh 804d)
